"Ah ah ah, you didn't say the magic word!"
Stupid Dennis Nedry, you ruined everything. You also became an indelible part of Jurassic Park canon, with your annoying error message shutting down Samuel L. Jackson as he tried to regain control of the island.
Thanks to programmer Tully Robinson's "Jurassic Systems," now you can play the role of Jurassic Park computer engineer. Be sure to watch the video before you get started, and hold on to your mostly-finished cigarettes.
Somewhere, a Dilophosaurus is getting indigestion.
[Via Laughing Squid]